Journal of Nematology (2004) 36, p. 342 (Porazinska et al.)

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Dorota L. Porazinska, P.D. Pratt and R.M. Giblin-Davis (2004)
Plant-soil biota feedbacks as a mechanism of Melaleuca quinquenervia invasion in the Florida Everglades
Journal of Nematology 36 (3), 342-342
paper presented at the Society of Nematologists 43rd Annual Meeting, Estes Park, Colorado 7-11 August 2004
Abstract: There are several leading theories explaining the extraordinary success of invasive plants but rarely are soil biota considered as an important factor mitigating plant invasions. We characterize plant-soil biota interactions in the form of a feedback system, where plant species affect the composition and abundance of soil biota (alteration of soil community) and the soil biota in turn feeds back to the plant community (alteration of aboveground diversity and productivity). We investigated the composition and diversity of nematode communities from soils dominated by the invasive tree Melaleuca quinquenervia as compared to adjacent soils supporting native non-invaded plant communities at 6 research sites in the Florida Everglades. Despite the significant geographical separation of the sites and their differences in soil type, hydrology, and native plant composition, there were consistent differences in nematode abundance and diversity between the tested plant communities. Abundances of bacterivores, herbivores, and total nematodes were suppressed in plant communities invaded by M. quinquenervia by 10, 75, and 45%. In addition, native stands were dominated by herbivores, while M. quinquenervia stands were dominated by bacterial feeders. The diversity of nematodes was also affected by the invasion process. Overall diversity of nematodes (genus level) was significantly lower (20%) under the exotic versus under the native plant communities. The decline of diversity was particularly high for herbivorous nematodes (50%). We also examined soil chemistry, texture, and plant diversity. The results provide strong support for the plant-soil biota feedback system as a mechanism of M. quinquenervia invasion of the Florida Everglades ecosystems.
Database assignments for author(s): Robin M Giblin-Davis, Paul D. Pratt

Research topic(s) for pests/diseases/weeds:
environment - cropping system/rotation


Pest and/or beneficial records:

Beneficial Pest/Disease/Weed Crop/Product Country Quarant.


Melaleuca quinquenervia (weed) U.S.A. (SE)